Solin is included in local transport network of Split, served by Promet buses. There are two main stops in central area of Solin - Sirina, south from the center and Bilankusa, north from the center. You'll recognize Sirina as the second stop after the big Mercator shopping center that will be on your right hand side if you're taking a bus from Split. If you want to reach Salona then get off at Bilankusa stop (buses #1 and #16) or go for two more stops from Bilankusa on line no. 1 (that way you'll reach Manastirine).
Local lines no. 1 and 16 depart from the stop in front of the National Theatre in Split every 15 minutes, more frequently during rush hours and less frequently (every 30 mins) on Sundays and holidays. You can also catch them at any stop along Domovinskog rata street in Split.
For Sirina you can also catch suburban buses on lines no. 33, 34 and 35 as well as buses serving lines to Kastela (no. 38) and Trogir (no. 37). Bus no. 37 will take you to the Airport as well.
Area of Solin is in the second fare zone. This system functions in a way that you need 1 zone ticket if travelling within one zone, and appropriate number of zones for each crossing of zone borders. This means that you'll need one fare zone ticket for travels within Solin, two fare zone tickets for Split or Kastela and three fare zone ticket if you want to reach Trogir from Solin. Tickets bought in advance at Promet kiosks are cheaper than ones sold by drivers.
For detailed bus schedules check the following webpage:
Reaching Solin by car is easy since it is located on the crossroads of fast roads around Split. You'll pass Solin if you're travelling along the Adriatic tourist road (Jadranska magistrala) or if you're arriving by A1 road from Sinj. It will also be on your way if you've headed from Split to Kastela or Trogir.
From Split take any of the streets leading to exits from the peninsula and then turn in direction north-west.
You'll find free parking in streets south from Gospin Otok or in Bilankusa, north from the center. Otherwise, you'll have to pay 3 kn per hour on parking lots in Zvonimirova and Radiceva streets or at Gospin otok in Solin center.
The route to Salona archaeological park is clearly marked by brown marks on all major roads. Parking is free at the entrance to Manastirine.